823 citations
- University of HelsinkiFI19 papers
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11 papers · 2 filters
Crossover effects in the random exchange spin-1/2 antiferromagnetic chain
Nicolas laflorencie, Heiko Rieger, Anders W. Sandvik +1
The random antiferromagnetic spin-1/2 XX and XXZ chain is studied numerically for varying strength of the disorder, using exact diagonalization and stochastic series expansion meth…
Two-Dimensional Quantum XY Model with Ring Exchange and External Field
R. G. Melko, A. W. Sandvik, D. J. Scalapino
We present the zero-temperature phase diagram of a square lattice quantum spin 1/2 XY model with four-site ring exchange in a uniform external magnetic field. Using quantum Monte C…
Structural and magnetic properties of MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds with M = Fe and Co
V. P. S. Awana, Anurag Gupta, H. Kishan +5
MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds, with M = Fe and Co, have been synthesized through a solid-state reaction route. Both compounds crystallize in a tetragonal structure (space g…
Iron and molybdenum valences in double-perovskite (Sr,Nd)2FeMoO6: electron-doping effect
J. Linden, T. Shimada, T. Motohashi +2
Double perovskite, (Sr1-xNdx)2FeMoO6, was doped with electrons through partial substitution of divalent Sr by trivalent Nd (0 < x < 0.2). The Fe valence and the degree of B-site or…
Magnetic ordering in a doped frustrated spin-Peierls system
Nicolas Laflorencie, Didier Poilblanc, Anders W. Sandvik
Based on a model of a quasi-one dimensional spin-Peierls system doped with non-magnetic impurities, an effective two-dimensional Hamiltonian of randomly distributed S=1/2 spins int…
The directed-loop algorithm
Anders W. Sandvik, Olav F. Syljuasen
The directed-loop scheme is a framework for generalized loop-type updates in quantum Monte Carlo, applicable both to world-line and stochastic series expansion methods. Here, the d…